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click-handler.html
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click-handler.html
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<title>OpenLayers Click Handler Example</title>
<link rel="stylesheet" href="../theme/default/style.css" type="text/css">
<link rel="stylesheet" href="style.css" type="text/css">
<style type="text/css">
#map {
width: 340px;
height: 170px;
border: 1px solid gray;
}
#west {
width: 350px;
}
#east {
position: absolute;
left: 370px;
top: 4em;
}
table td {
text-align: center;
margin: 0;
border: 1px solid gray;
}
textarea.output {
text-align: left;
font-size: 0.9em;
width: 250px;
height: 65px;
overflow: auto;
}
</style>
<script src="../lib/Firebug/firebug.js"></script>
<script src="../lib/OpenLayers.js"></script>
<script type="text/javascript">
OpenLayers.Control.Click = OpenLayers.Class(OpenLayers.Control, {
defaultHandlerOptions: {
'single': true,
'double': false,
'pixelTolerance': 0,
'stopSingle': false,
'stopDouble': false
},
initialize: function(options) {
this.handlerOptions = OpenLayers.Util.extend(
{}, this.defaultHandlerOptions
);
OpenLayers.Control.prototype.initialize.apply(
this, arguments
);
this.handler = new OpenLayers.Handler.Click(
this, {
'click': this.onClick,
'dblclick': this.onDblclick
}, this.handlerOptions
);
},
onClick: function(evt) {
var output = document.getElementById(this.key + "Output");
var msg = "click " + evt.xy;
output.value = output.value + msg + "\r\n";
},
onDblclick: function(evt) {
var output = document.getElementById(this.key + "Output");
var msg = "dblclick " + evt.xy;
output.value = output.value + msg + "\n";
}
});
var map, controls;
function init(){
map = new OpenLayers.Map('map');
var layer = new OpenLayers.Layer.WMS(
"OpenLayers WMS",
"http://vmap0.tiles.osgeo.org/wms/vmap0",
{layers: 'basic'}
);
map.addLayers([layer]);
controls = {
"single": new OpenLayers.Control.Click({
handlerOptions: {
"single": true
}
}),
"double": new OpenLayers.Control.Click({
handlerOptions: {
"single": false,
"double": true
}
}),
"both": new OpenLayers.Control.Click({
handlerOptions: {
"single": true,
"double": true
}
}),
"drag": new OpenLayers.Control.Click({
handlerOptions: {
"single": true,
"pixelTolerance": null
}
}),
"stopsingle": new OpenLayers.Control.Click({
handlerOptions: {
"single": true,
"stopSingle": true
}
}),
"stopdouble": new OpenLayers.Control.Click({
handlerOptions: {
"single": false,
"double": true,
"stopDouble": true
}
})
};
var props = document.getElementById("props");
var control;
for(var key in controls) {
control = controls[key];
// only to route output here
control.key = key;
map.addControl(control);
}
map.zoomToMaxExtent();
}
function toggle(key) {
var control = controls[key];
if(control.active) {
control.deactivate();
} else {
control.activate();
}
var status = document.getElementById(key + "Status");
status.innerHTML = control.active ? "on" : "off";
var output = document.getElementById(key + "Output");
output.value = "";
}
</script>
</head>
<body onload="init()">
<h1 id="title">Click Handler Example</h1>
<div id="west">
<div id="tags">
event, events, propagation, advanced
</div>
<p id="shortdesc">
This example shows the use of the click handler.
</p>
<div id="map" class="smallmap"></div>
<p>
The click handler can be used to gain more flexibility over handling
click events. The handler can be constructed with options to handle
only single click events, to handle single and double-click events,
to ignore clicks that include a drag, and to stop propagation of
single and/or double-click events. A single click is a click that
is not followed by another click for more than 300ms. This delay
is configured with the delay property.
</p>
<p>
The options to stop single and double clicks have to do with
stopping event propagation on the map events listener queue
(not stopping events from cascading to other elements). The
ability to stop an event from propagating has to do with the
order in which listeners are registered. With stopSingle or
stopDouble true, a click handler will stop propagation to all
listeners that were registered (or all handlers that were
activated) before the click handler was activated. So, for
example, activating a click handler with stopDouble true after
the navigation control is active will stop double-clicks from
zooming in.
</p>
</div>
<div id="east">
<table>
<caption>Controls with click handlers (toggle on/off to clear output)</caption>
<tbody>
<tr>
<td>single only</td>
<td><button id="singleStatus" onclick="toggle('single')">off</button></td>
<td><textarea class="output" id="singleOutput"></textarea></td>
</tr>
<tr>
<td>double only</td>
<td><button id="doubleStatus" onclick="toggle('double')">off</button></td>
<td><textarea class="output" id="doubleOutput"></textarea></td>
</tr>
<tr>
<td>both</td>
<td><button id="bothStatus" onclick="toggle('both')">off</button></td>
<td><textarea class="output" id="bothOutput"></textarea></td>
</tr>
<tr>
<td>single with drag</td>
<td><button id="dragStatus" onclick="toggle('drag')">off</button></td>
<td><textarea class="output" id="dragOutput"></textarea></td>
</tr>
<tr>
<td>single with stop</td>
<td><button id="stopsingleStatus" onclick="toggle('stopsingle')">off</button></td>
<td><textarea class="output" id="stopsingleOutput"></textarea></td>
</tr>
<tr>
<td>double with stop</td>
<td><button id="stopdoubleStatus" onclick="toggle('stopdouble')">off</button></td>
<td><textarea class="output" id="stopdoubleOutput"></textarea></td>
</tr>
</tbody>
</table>
</div>
</body>
</html>